What it is and where it sits in the series
The Molex 430451214 is the 12-circuit member of the Micro-Fit 3.0 43045 series — a dual-row 3.00 mm pitch header with through-hole kinked-pin termination and a 4-wall shroud, positioned mid-range in the series by position count. The dual plating split is what this series is known for: gold over nickel on the mating face (30.0 µin) for durability, and 100.0 µin tin on the solder tail for solderability. Those are two separate finish zones, not one blended specification. Rated 8 A per contact at 600 V across a -40°C to 105°C operating window — the voltage headline is well above what most board-level 3.00 mm headers carry, so this one is not just a signal-density play. The locking ramp and board guide together handle two different jobs: the ramp locks the mating receptacle against vibration, and the board guide keys the header into the PCB during through-hole paste-and-reflow (or wave) assembly so the connector seats square.
Fit and BOM match
For the design engineer: the 12-circuit, dual-row footprint at 3.00 mm pitch is the selection constraint. The header accepts the matching Micro-Fit 3.0 receptacle housing with the appropriate terminal (the male pin here is a crimp-contact header, not a surface-mount tail — it receives the crimp terminal from the wire side). Contact post length is 0.125 in (3.18 mm) — through-hole tail; verify pad stack-up against the board thickness to confirm clinch engagement.
Sourcing and lifecycle
The series base product number is 043045, which appears across multiple position-count variants in the same family. Confirm the 12-circuit match against the BOM position count and the locking ramp engagement before committing.